Fig. 10
Proper motions of the tip of the south lobe of Ou4. Top and middle panels: POSS1 (epoch 1952-07-22) and POSS2 (epoch 1993-06-25) blue plates in logarithmic greyscale smoothed with a Gaussian kernel (
) with green and blue contours overlaid. Bottom panel: the green and blue contours overlaid on our [O iii] INT mosaic (epoch 2012-08-19). The possible motions of four emission features between the POSS1 and POSS2 epochs are indicated in each panel by short red lines (average size of ~
).
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